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  • DC attic fan motor

    Does anyone here know where to buy the DC motor for the attic fan,so I can replace my ac motor attic fan .because I am making a solar panel but do not want to use inverter.thanks

  • #2
    solar attic fan

    You may want to consider a solar attic fan. Here is a link to one at SolarTown: http://www.solartown.com/store/produ...c-30-watt-fan/

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    • #3
      What he probably wants is one of these: http://www.solartown.com/store/produ...e-30-watt-fan/

      I have 2 of them, one sucking and one blowing. Both run on 12v DC.

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      • #4
        Originally posted by satguyjim View Post
        What he probably wants is one of these: http://www.solartown.com/store/produ...e-30-watt-fan/

        I have 2 of them, one sucking and one blowing. Both run on 12v DC.
        I could say something inappropriate to that
        Kind of like Bart Simpson
        Rich
        WWW.solarsaves.net

        NABCEP certified Technical Sales Professional

        http://www.solarpaneltalk.com/showth...Battery-Design

        http://www.calculator.net/voltage-drop-calculator.html (Voltage drop Calculator among others)

        www.gaisma.com

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        • #5
          $535.00 for an attic fan!!!!!!

          I am living San fernando valley,CA and My 180w attic fan run 8hr a day in hot summer = 1.4KWH X 180day/year =252kwh/year x 14cent/kw = $ 35.28/year x 15 years,16 day = $535.00.Man!! not a good idea to go for solar.

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          • #6
            radiator cooling fan 12V

            Does any one know how many watt panel to run the 12v radiator cooling fan .

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            • #7
              I have not done exact measurements on the radiator fan im using. But since im supplying it power from a 15 Vmp, 3.5 amp panel, its working same as when it is on the car. Roughly 50 watts I guess. Fan is from a 96 civic, about 12 inches in dia. If there is a cloud or the sun is low, it would just slow down a bit, but not stop.

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              • #8
                Automotive radiator cooling fans pull 10 - 20 amps @ 12V. Way too much for household attic use. There are special purpose, low power fans for that.
                spreadsheet based voltage drop calculator:
                http://www.solar-guppy.com/download/...calculator.zip
                http://www.solarpaneltalk.com/showth...oss-calculator

                http://www.mike-burgess.org/PVinfo_2.html

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                • #9
                  Does 100w panel work good for this fan:http://cgi.ebay.com/ebaymotors/14-UN...item2567ea30c5

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                  • #10
                    Fan is 80w @ 12v, about 6.7amps
                    panel is 100w @18v, about 5.6amps

                    Not exact match but it will still run and pull a lot of air.
                    That type of fan is a bit noisy though.

                    Thats a lot of expensive power on your attic.
                    You could use a smaller version of the fan since it would be running continuously the whole day.
                    Try searching the salvage yard for cheap DC fans and motors.

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                    • #11
                      I'd love to hear more discussion about using salvage fans with solar panels in your attic. If you can get a fan for $40 and a 80 watt solar panel for $100, that's half the cost of what you would find for a regular 20 watt solar attic fan. The cost savings and extra fan power makes the diy solution so much more attractive to me. I also like the idea of not having to drill a hole in your rough. If you already have a gable vent and can use a remote solar panel, there's no holes that you have to cut, right?

                      Originally posted by axis11 View Post
                      Fan is 80w @ 12v, about 6.7amps
                      panel is 100w @18v, about 5.6amps

                      Not exact match but it will still run and pull a lot of air.
                      That type of fan is a bit noisy though.

                      Thats a lot of expensive power on your attic.
                      You could use a smaller version of the fan since it would be running continuously the whole day.
                      Try searching the salvage yard for cheap DC fans and motors.

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                      • #12
                        Those portable air compressors - the little 12v ones that claim 220psi are just geared dc motors.
                        They will operate with as little as 5v however - at least the one I tested would.
                        DIY one could be had for 10$, add an rc plane prop and you're blowing hot air with little amperage.
                        I've hooked one up to a peltier on top of a backup stove, to force air through a vent when stove is running just as those "eco stove fans" work.
                        Surely a 1w panel would do the same work.

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                        • #13
                          Doesn't a car radiator motor or a portable air compressor motor has brushes and will limit the life of such motor's ?

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                          • #14
                            Originally posted by caliman View Post
                            Does any one know how many watt panel to run the 12v radiator cooling fan .
                            I have one hooked to a 100w panel in my attic. Been there over 3 years now without a problem.

                            I had full access to a salvage yard and pulled the fan and relay from 4 different cars. Hooked them up one at a time and let them run for 5 minutes and measured the motor temp. I went with the one that had the lowest temp. Wired the relay to a snap switch (on 95F off 85F) and pointed the panel more to the west. It runs from noon tell sunset through the summer.

                            WWW

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                            • #15
                              Originally posted by Johann View Post
                              Doesn't a car radiator motor or a portable air compressor motor has brushes and will limit the life of such motor's ?
                              In general, yes.
                              The only exception would be the more complex motors that use electronics to supply pulsed DC to multiple windings. (So called brushless DC motor systems.)
                              SunnyBoy 3000 US, 18 BP Solar 175B panels.

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